命名空间"Microsoft.SqlServer"中不存在类型

using System; using Microsoft.SqlServer.Management.Smo; using Microsoft.SqlServer.Management.Common; namespace DAL { public class SMODemo { public static void Main() { ServerConnection conn = new ServerConnection(); conn.LoginSecure = fals

using System;
using Microsoft.SqlServer.Management.Smo;
using Microsoft.SqlServer.Management.Common;

namespace DAL
{
    public class SMODemo
    {
        public static void Main()
        {
            ServerConnection conn = new ServerConnection();
            conn.LoginSecure = false;
            conn.Login = "userName";
            conn.Password = "password";
            Server svr = new Server(conn);
            Console.WriteLine(svr.Name + " " + svr.Information.VersionString);
        }
    }
}
编译时有下面的错误：怎么解决呢？

SMODemo.cs(4,27): error CS0234:
        命名空间“Microsoft.SqlServer”中不存在类型或命名空间名称“Management”(
        是缺少程序集引用吗?)
SMODemo.cs(5,27): error CS0234:
        命名空间“Microsoft.SqlServer”中不存在类型或命名空间名称“Management”(
        是缺少程序集引用吗?)